Modern Machine Shop
Sterling Gun Drills offers solid-carbide tip and flute gundrills in diameters ranging from 0.0530" (1.35 mm) to 0.1600" (4.06 mm) with overall lengths as long as 13.5" (340 mm). The company says the drills are useful for deep and precision hole drilling of various medical parts, including probing devices and bone screws. They are manufactured with inch and metric drivers and feature a “D” or “teardrop” coolant hole. The drills are available in 30-degree × 20-degree or 40-degree × 30-degree “facet” or “sweep” nose grinds.